chatterer vs collocutor

chatterer

noun
  • A person who chatters; a chatterbox. 

  • Any of several passerine birds, mostly from South America; especially the cotingas. 

collocutor

noun
  • Any of the people engaged in a conversation 

How often have the words chatterer and collocutor occurred in a corpus of books? (source: Google Ngram Viewer )